I was browsing through the Nanocom web site and found an interesting FAQ posted just yesterday, it says the new 2.05 firmware will support TD5 temperature alerts (you will need to fit your own buzzer to the nanocom though)

Had a quick look at the downloads page, only 2.04 is up there at the moment...



excerpt:

25 05 2009
Overheating warning and buzzer installation


With the 2.05 firmware an overheating warning is been added to the INSTRUMENT mode.

TO set the threshold value you have to reach( only in STANDALONE ) the item NANOCOM SETUP -> HOT WARNING TRESHOLD and modify the value,
that is 100° as default

When the temperature of the coolant fluid is read higher the threshold for more than 5 times the NANOCOM activate the warning.

When the warning is active the LED flashes with RED LIGHT and a buzzer output is activated......



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